diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt index 640e0eca40..298a031310 100644 --- a/docs/interop/qcow2.txt +++ b/docs/interop/qcow2.txt @@ -25,6 +25,9 @@ The first cluster of a qcow2 image contains the file header: is stored (NB: The string is not null terminated). 0 if the image doesn't have a backing file. + Note: backing files are incompatible with raw external data + files (auto-clear feature bit 1). + 16 - 19: backing_file_size Length of the backing file name in bytes. Must not be longer than 1023 bytes. Undefined if the image doesn't have